Exercises


A machine was created to lift heavy objects off the ground using hydraulic pressure. What is the minimum force(in kilograms) that must be applied by the hydraulic piston to just lift the 50kg mass off the ground? What is the advantage and disadvantage of attaching the piston close to the fulcrum? 

A student was asked to devise a machine that could lift maximum mass off the ground using a 10kg counter weight. The student came up with the design on the right. Pulley "A" is twice as big as pulley "B" and pulley "C" is twice as big as pulley "A". Can this machine lift a heavy mass off the ground?

